{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T02:42:36Z","timestamp":1784860956806,"version":"3.55.0"},"reference-count":193,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2020,11,13]],"date-time":"2020-11-13T00:00:00Z","timestamp":1605225600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>With the development of high energy physics experiments, a large amount of exotic states in the hadronic sector have been observed. In order to shed some light on the nature of the tetraquark and pentaquark candidates, a constituent quark model, along with the Gaussian expansion method, has been employed systematically in real- and complex-range investigations. We review herein the double- and fully-heavy tetraquarks, but also the hidden-charm, hidden-bottom and doubly charmed pentaquarks. Several exotic hadrons observed experimentally were well reproduced within our approach; moreover, their possible compositeness and other properties, such as their decay widths and general patterns in the spectrum, are analyzed. Besides, we report also some theoretical predictions of tetra- and penta-quark states which have not seen by experiment yet.<\/jats:p>","DOI":"10.3390\/sym12111869","type":"journal-article","created":{"date-parts":[[2020,11,13]],"date-time":"2020-11-13T10:32:47Z","timestamp":1605263567000},"page":"1869","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":135,"title":["Tetra- and Penta-Quark Structures in the Constituent Quark Model"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1938-0026","authenticated-orcid":false,"given":"Gang","family":"Yang","sequence":"first","affiliation":[{"name":"Department of Physics, Zhejiang Normal University, Jinhua 321004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6120-9962","authenticated-orcid":false,"given":"Jialun","family":"Ping","sequence":"additional","affiliation":[{"name":"Department of Physics, Nanjing Normal University, Nanjing 210023, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5838-7103","authenticated-orcid":false,"given":"Jorge","family":"Segovia","sequence":"additional","affiliation":[{"name":"Dpto. Sistemas F\u00edsicos, Qu\u00edmicos y Naturales, U. Pablo de Olavide, E-41013 Sevilla, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,11,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"481","DOI":"10.1088\/0954-3899\/31\/5\/017","article-title":"Constituent quark model study of the meson spectra","volume":"31","author":"Vijande","year":"2005","journal-title":"J. Phys. G"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1819","DOI":"10.1142\/S0217732308027102","article-title":"Dynamical study of heavy-baryon spectroscopy","volume":"23","author":"Yang","year":"2008","journal-title":"Mod. Phys. Lett. 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